24 
BULLETIN 933, TJ. S. DEPARTMENT OP AGRICULTURE. 
(18) Six stumps at Valley Falls, Kans., in tlie bottom lands of Delaware 
Creek. Averaged 25 inches in diameter, stump height, at 64 years; also 
above the average rate of growth. 
(19) Five stumps in northern Delaware. Averaged 25 inches in diameter, 
stump height, at 94 years. 
(20) One hundred 20-inch logs taken at random in Missouri, Iowa, and 
Kansas. Averaged 83 years of age at the top end. Logs of this size measured 
in Indiana and Ohio were 81 years of age. These figures would apparently 
indicate that the rate of diameter growth of walnut is about the same in the 
river-bottom woodlands of the prairie States as it is farther ea'st. 
Table 4.- 
-Examples of diameter growth of black walnut based on age described 
under the corresponding numbers on page 23. 
No. 
Grown in— 
Age (years). 
10 
20 30 40 50 60 70 80 | -90 100 110 120 130 140 150 
Diameter at breastneight (inches). 
/Forest 
\Open. 
/Forest 
\Open. 
0) 
C 1 ) 
0) 
(*) 
C 1 ) 
(0 
0) 
«— .. 
0) 
( 1 )—.. 
0) 
G).— . 
0.2 
1.4 
.6 
.6 
1.0 
1.7 
1.4 
1.4 
2.4 
4.1 
.4 
2.0 
.9 
2.0 
1.4 
.8 
1.4 
5.4 
3.1 
3.1 
4.9 
7.0 
4.4 
5.3 
6.4 
10.2 
3.1 
6.4 
4.4 
7.5 
5.8 
•7.1 
3.6 
10.2 
5.4 
5.4 
9.1 
12.6 
7.4 
8.1 
10.7 
15.0 
6.2 
10.6 
7.4 
13.1 
10.2 
13.0 
6.5 
14.8 
8.0 
8.5 
12.6 
16.1 
10.7 
10.8 
15.0 
18.3 
9.6 
14.6 
11.8 
18.1 
14.0 
17.5 
12.1 
18.8 
10.8 
11.8 
14.6 
18.8 
13.5 
13.5 
18.3 
20.4 
12.9 
17.6 
16.0 
22.0 
17.4 
20.6 
16 1 
19.5 
24.6 
15.2 
17.8 
19.4 
22.0 
18.0 
19.6 
24.0 
21.4 
?,?,. 3 

12.9 
17.2 
20.5 
20.5 
23.3 
19.6 
19.1 
22.8 
20.8 
24.9 
22.4 
26.6 
15 
17.0 
20,6 
23.5 
21.4 

15.8 
16 fi 
23.3 
24.3 
25.6 
26.8 
28.0 
29.3 
9 1 1 
26.3 
28.0 
16 4 
19.2 
24.0 
24.3 
21.9 
25.7 
23.9 
21 
?o *; 
25 n 

?n o 
22.3 
24.0 
24.2 
24.6 
?3 4 
See description on p. 23. 
VOLUME GROWTH. 
As the growth of a tree in volume depends upon the rate of growth 
in both diameter and height, it is more variable than* either. A 
statement of the increment in board feet to be expected at the end 
of any period will consequently have little bearing upon anj^ par- 
ticular stand. In order, however, to present a general idea of the 
average volume growth of individual trees, Table 5 has been pre- 
pared. It indicates fairly well the volume growth in groves in the 
Ohio Valley, but does not apply to single trees or rows grown in 
the open, to forest-grown trees, particularly in the eastern part of the 
range, or to trees in artificial plantations. It is less applicable to 
groves in regions east or west of the Ohio Valley. 
It is evident from this table that walnut may be grown most 
advantageously, from the standpoint of greatest continuous volume 
production, on long rotations, for the reason that both the average 
annual growth and the current annual groAvth continue to increase up 
